1.1 ,This test method covers the electrometric measurement of the pH of peat materials, not soil. The standard for measurement of pH in soil is Test Method D4972, nor does this cover the measurement of pH for corrosion testing, which is contained in Test Method G51. These standards are being intentionally kept separate for clarity at the request(s) of the governing sub-committees. It is a means of expressing the degree of acidity or alkalinity of peat material suspended in water and 0.01 M calcium chloride solution.